JP3517464B2 - Facsimile communication method and facsimile apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile communication system and a communication device.

[0002]

2. Description of the Related Art Conventionally, in this type of facsimile communication system, as shown in FIG. The half-duplex communication method defined in No. 30 is generally used.

[0003]

However, in the above-mentioned conventional example, V. In the communication of communication procedures other than the image information by 21, the synchronization signal of about 1 second is added to the front of each procedure signal in order to synchronize the data reception in both the transmitting and receiving sides. Even for transmitting 0.1 second of data, a 1.1 second signal has to be sent out, and there is a disadvantage that communication time is extra due to the synchronization signal.

It is an object of the present invention to provide a facsimile communication system and a communication device capable of reducing the time loss caused by the synchronization of both transmission and reception and shortening the communication time.

[0005]

[Means for Solving the Problems]
In the invention of 4 , the transmission / reception of the procedure signal is full-duplex communication, and the signal from the other party can be transmitted immediately after the reception of the signal from the other party by connecting with the synchronization signal without making the signal non-signal. The communication time can be shortened.

Further, the second and fifth inventions of the present application are such that the transmission and reception of the procedure signal is full-duplex communication, the response to the signal is detected after the procedure signal is transmitted, and the procedure shifts to the previous procedure. In addition, if either the transmitting side or the receiving side cannot receive data due to the line condition and there is a possibility that the same signal will be sent again, after sending the procedure signal, until the appropriate response signal is returned. Between the procedure signal and the procedure signal
By transmitting the synchronization signal without making the signal null , the procedure signal can be immediately retransmitted after the maximum time for the response from the other party to be returned due to the characteristics of the line, and the recovery time when an error occurs can be shortened. it can.

[0007]

[0008]

Further, in the third and sixth inventions related to the present application, the procedure signals are transmitted and received in full-duplex communication, and the procedure is performed except when the procedure signals are transmitted and the high-speed signals are received after the transmission of the low-speed signals is started. By sending the synchronization signal without making a signal between the signal and the procedure signal, there is no need to send an unnecessary low-speed signal when the communication procedure is speeded up and the high-speed signal is received, and the performance of high-speed reception is improved. It acts to improve and lower the price of modems.

[0010]

1 is a block diagram showing the configuration of a communication device according to an embodiment of the present invention.

The CPU 2-1 follows the entire communication device, that is, R according to the program stored in the ROM 2-2.
AM 2-3, nonvolatile RAM 2-4, operation unit 2-5, display unit 2-6, image processing unit 2-7, reading unit 2-8, recording unit 2-9, driving unit 2-10, communication unit 2 -11, NCU
The unit 2-12 and the microphone / speaker unit (not shown) are controlled.

The RAM 2-3 stores the binarized image data read by the reading unit 2-8 or the recording unit 2-9.
It stores the binarized data recorded in 1. and stores the binarized data output from the subscriber line 2-15 through the NCU unit 2-12 for the signal modulated by the communication unit 2-11. is there. The RAM 2-3 is the subscriber line 2-1.
It is also used to demodulate the analog waveform input from the No. 5 via the NCU unit 2-12 and the communication unit 2-11 and store the binarized data.

The non-volatile RMA 2-4 is a battery-backed SRAM in which data such as a telephone number unique to the apparatus, an abbreviated user name, communication results, a holding tone, and OGM data are stored.

The operation unit 2-5 includes a start key for transmission and reception, a mode key for designating an operation mode such as fine and standard in a transmission image, a copy key for copying, and a stop key for stopping the operation. , Numeric keypad for dialing and various settings, Off-hook key used for calling, Hold key for sending hold tone to the line, Record key for registering voice response message, and other It consists of function keys for special functions.

The CPU 2-1 detects the pressed states of these keys and controls the respective parts according to the pressed states.

The display unit 2-6 is composed of a dot matrix type LCD and an LCD driver.
Various displays are performed based on the control from U2-1.

The reading unit 2-8 is composed of a DMA controller, a CCD or a contact image sensor (CS), a general-purpose IC, a binarization circuit, etc., and a CPU 2-
The data read using CCD or CS is binarized based on the control of 1, and the binarized data is sequentially RAM.
Send to 2-3.

Further, the read image data can be transferred to the image memory through the image processing section 2-7.

The recording unit 2-9 is a DMA controller, B
4 / A4 size thermal head or BJ printer head (bubble jet printer head) and general-purpose IC
And the like, and is controlled by the CPU 2-1.
The recording data stored in the AM 2-3 is taken out and printed out as a hard copy.

The driving unit 2-10 controls the stepping motor for driving the paper feeding / discharging rollers of the reading unit 2-8 and the recording unit 2-9, the gear for transmitting the driving force of the motor, and the motor. And a driver circuit for doing so.

The communication unit 2-11 is mainly composed of a modem, and the modem is a V.2 standardized by ITU-T (formerly CCITT). 34, V.I. 32, V.I. 32bis, V.I. 17,
V. 29, V.I. 27 ter, V.I. 23, V.I. 21 (H,
(Both L channels) modem and voice encoding / compression / decompression function (compression method such as PCM, ADPCM, VSELP),
It is composed of a clock generator circuit connected to these modems, an operational amplifier for gain adjustment, a hold sound transmission circuit, etc.
Under the control of the PU2-1, the transmission data stored in the RAM2-3 or the voice data and the hold sound data stored in the RAM2-4 are modulated into an analog signal, and NC
The data is output to the subscriber line 2-15 via the U section 2-12.

Further, the communication section 2-11 is for the subscriber line 2
The analog signal from -15 is introduced via the NCU section 2-12, and the data is demodulated and binarized to the RAM2-.
OGM data and hold tone data in 3 are stored in the non-volatile RAM2-
4 is to be stored.

The NCU section 2-12 includes a DC capturing circuit, an AC capturing circuit, a Ci detecting circuit, a two-wire to four-wire converting circuit, and a CP.
It has a function of calling a telephone number by dial pulse or DTMF tone under the control of U2-1 and connects the subscriber line 2-15 to the communication unit 2-11.

LINE 2-13 is a subscriber line connected to the NCU section 2-12.

The sensor unit 2-14 is composed of a recording paper width sensor, a recording paper presence sensor, a document width sensor, and a document presence sensor, and detects the states of the document and the recording paper under the control of the CPU 2-1.

FIG. 2 is an explanatory diagram showing a communication procedure in the first embodiment of the present invention. Below, in the figure, the transmitting side,
The operation of each receiving side will be described.

First, the operation of the transmitting side will be described.

C is transmitted from the receiving side while transmitting the CNG signal.
Preparation for receiving the ED signal and the synchronization signal is performed, and when either one is received, the CNG signal transmission is stopped, and if the detected signal is the reception signal, the synchronization signal transmission is started.

While transmitting the synchronizing signal, the T.T.
30 NSF / CSI / DIS signals specified in Recommendation are received, NSS signals are sent when NSF signals are received, TSI signals are sent when CSI signals are received, and DI
When the S signal is received, the DCS signal is transmitted. At this time, N
If the CSI signal or the DCS signal is not received after the SS signal is sent, the preparation for receiving the signal is continuously performed while the sync signal is sent again.

After the DCS signal is sent out, a TCF signal which is a high speed signal is sent out after a no signal state for 50 ms. TCF
After the signal has been sent, after 50 ms of no signal, the sending of the synchronizing signal is started, and when the CFR signal from the receiving side is received, the sending of the synchronizing signal is stopped.

After the sending of the synchronizing signal is stopped, the image signal is sent as a high-speed signal after the no-signal state for 50 ms, and after the sending of the image signal is completed, the synchronizing signal is sent after the no-signal state for 50 ms.
After transmitting the synchronization signal for a second, the EOP signal is transmitted.

After the transmission of the EOP signal is completed, the transmission of the synchronization signal is started. When the MCF signal is received from the receiving side, the transmission of the synchronization signal is stopped and the DCN signal is transmitted to release the line.

Next, the operation on the receiving side will be described.

When the receiving side receives an incoming call, it sends out a CED signal notifying the transmitting side that it is an automatic response.
After the non-signal period of s, the synchronization signal is prepared for reception while transmitting the synchronization signal.

After transmitting the synchronizing signal for 1 second, if the synchronizing signal is received from the transmitting side, the NSF / CSI / DIS signal is transmitted. Then, after the DIS signal is transmitted, the synchronization signal is started to be transmitted, and the preparation for high-speed signal reception is started.

When the TCF signal is received from the transmitting side, the sending of the synchronizing signal is stopped and the CFR signal is sent. And
After transmitting the CFR, the synchronizing signal is transmitted, and when the image signal composed of the high speed signal is received from the transmitting side, the transmitting of the synchronizing signal is stopped.

When the end of the image signal is detected, next, preparation for receiving the synchronizing signal is carried out, and when the synchronizing signal is received, the synchronizing signal is sent out.

When the EOP signal is received, the sending of the synchronizing signal is stopped, the MCF signal is sent, and after the sending is completed, the synchronizing signal is sent, and when the DCN signal is received, the synchronizing signal is stopped,
Release the line.

Next, in the above communication procedure, the operation when a reception error occurs will be described in the order of the transmitting side and the receiving side. FIG. 3 is an explanatory diagram showing a communication procedure in this case.

First, the transmitting side prepares to receive the CED signal and the synchronizing signal from the receiving side while transmitting the CNG signal, and when either of them is received, the transmission of the CNG signal is stopped and the detected signal is the received signal. If so, transmission of the synchronization signal is started.

While transmitting the synchronization signal, the T.T.
30 NSF / CSI / DIS signals specified in Recommendation are received, NSS signals are sent when NSF signals are received, TSI signals are sent when CSI signals are received, and DI
When the S signal is received, the DCS signal is transmitted. At this time, N
If the CSI signal or the DCS signal is not received after the SS signal is sent, the preparation for receiving the signal is continuously performed while the sync signal is sent again.

After the DCS signal is sent out, a TCF signal which is a high speed signal is sent out after a no signal state for 50 ms. TCF
After the signal has been sent, after 50 ms of no signal, the sending of the synchronizing signal is started, and when the CFR signal from the receiving side is received, the sending of the synchronizing signal is stopped.

After the sending of the synchronizing signal is stopped, the image signal is sent as a high-speed signal after the no-signal state for 50 ms, and after the sending of the image signal is finished, the synchronizing signal is sent after the no-signal state for 50 ms.
After sending the synchronizing signal for 1 second, the EOP signal is sent.

Then, after the transmission of the EOP signal is completed, the transmission of the synchronization signal is started, and if there is no response from the receiving side,
After 3 seconds, the EOP signal is sent again.

When the MCF signal from the receiving side is received, the sending of the synchronizing signal is stopped and the DCN signal is sent to release the line.

On the other hand, when there is an incoming call, the receiving side sends out a CID signal notifying the sending side that it is an automatic response, and after a 50 ms non-signal period, sending out the synchronizing signal while preparing to receive the synchronizing signal. I do.

After transmitting the synchronizing signal for 1 second, if the synchronizing signal from the transmitting side is received, the NSF / CSI / DIS signal is transmitted. Then, after the DIS signal is transmitted, the synchronization signal is started to be transmitted, and the preparation for high-speed signal reception is started.

After that, when the TCF signal from the transmitting side is received, the sending of the synchronizing signal is stopped and the CFR signal is sent. Then, after transmitting the CFR, the synchronizing signal is transmitted, and when the image signal composed of the high speed signal is received from the transmitting side, the transmission of the synchronizing signal is stopped.

Then, when the end of the image signal is detected, preparation for receiving the synchronizing signal is made next, and when the synchronizing signal is received, the synchronizing signal is sent out. After that, when the EOP signal is received, the sending of the synchronizing signal is stopped, the MCF signal is sent, and after the sending is completed, the synchronizing signal is sent.

Here, when the transmitting side cannot receive the MCF signal, the EOP signal is sent again after 3 seconds. Therefore, when the EOP signal is received again, the receiving side again receives the MOP signal.
When the CF signal is responded and the DCN signal is received, the synchronizing signal is stopped and the line is released.

Next, the operation of the first embodiment will be described with reference to the flow charts of FIGS.

First, the operation of the communication device at the time of transmission will be described with reference to the flowcharts of FIGS.

First, at S1, the CNG signal (110
0 Hz tone signal) is sent, the Ta timer is set to 2 seconds in S2, and then the synchronization signal (repeating pattern of data 7E: the same applies hereinafter) is monitored in S3 while monitoring the progress of Ta in S4. To receive.

When Ta time has elapsed in S4, the process returns to S1 and the CNG signal is sent again. Also, S3
And V. When the sync signal modulated by 21 is detected,
V.S. The transmission of the synchronization signal modulated at 21 is started.

Next, in S6, S8, and S10, V. 21
While transmitting the signal modulated by the V. When the NSF, CSI, and DIS signals modulated and transmitted at 21 are received and the NSF signal is received, the NSS signal is transmitted at S7, and when the CSI signal is received, at T9 at S9.
When the SI signal is transmitted and the DIS signal is received, the DCS signal is transmitted in S11. At this time, when the NSS signal and the TSI signal are not transmitted until the DIS signal is received, the synchronization signal is transmitted in S5. Here, various procedure data can be received even while the NSS signal and the TSI signal are being sent.

Next, after sending the DCS signal in S11, the training signal and the TCF signal modulated by the high speed signal are sent in 50 ms with a gap of 50 ms.

Next, in S13, the Tb timer is set to 3 seconds, and in S14, a synchronization signal is transmitted after a lapse of 50 ms.

Next, in S15, S16 and S20,
While monitoring the progress of Tb, V. The response signal modulated by 21 is received. And S14, S15, S16, S
At 20, when the Tb has passed or when the FTT signal is received, at S17, the same signal as the signal sent at S7, S9, and S11 is sent.

For example, when the DIS signal is received without receiving the NSF signal, the NSS signal is not transmitted. In this case, the NSS signal is not sent also in S17.

Next, in S18, the training signal and the TCF signal are transmitted after a lapse of 50 ms, Tb is set to 3 seconds again in S19, and the process returns to S14 to transmit the synchronization signal.

When the CFR signal is received in S20, the synchronizing signal is stopped in S21, and the image signal is transmitted after a lapse of 50 ms. When the image signal has been transmitted, the V. 1 for the sync signal modulated by 21
It is sent for a second, and then the EPO signal is sent in S23.

Next, in S24, the timer Tb is set to 3 seconds, and in S25, the transmission of the synchronizing signal is started again. Then, while transmitting the synchronization signal, S26 and S27
At, the MCF signal is received while monitoring the progress of Tb. When Tb time has elapsed, EOP is performed again in S23.
Sends a signal. When receiving the MCF signal, S
At 28, a DCN signal is transmitted, and at S29, the line is released and the communication ends.

Next, the operation of the communication device upon reception will be described with reference to the flow charts of FIGS.

This communication device receives an incoming call from the line,
The CPU 2-1 determines that there is an incoming call from the NCU 2-12, and the CML relay of the NCU 2-12 captures DC at 600 ohms.

Next, in step S51, a CED signal which is a response signal (in this embodiment, a single tone of 2100 Hz) indicating that the device has responded is transmitted.

After sending such a response signal, S
V.52. The sync signal modulated at 21 is sent for 1 second. Next, in S53, the NSF signal is transmitted, and in S54, C
The SI signal is transmitted, and the DIS signal is continuously transmitted in S55.

When the DIS has been transmitted, the timer Ta is set for 3 seconds in S56, and the progress of Ta and the reception of the DCS signal are performed while transmitting the synchronization signal in S57, S58, and S59. If the DCS signal cannot be received even after the lapse of Ta, the process returns to S53 and the NSF / CSI / DIS signal is transmitted again.

When the DCS signal is received, the TCF signal which is a high speed signal is received in S60, and if the TCF signal is correctly received, the CFR signal is sent in S61. If the TCF signal is not received correctly, the FTT signal is sent in S62. After sending out, the timer Ta is set to 3 seconds in S63, and after sending out the CFR signal or the FTT signal, the sync signal is sent out again without interruption.

Next, in S65, S67, and S68,
While monitoring the progress of Ta, the DCS signal and the high-speed signal are received. When the DCS signal is received, the process returns to S60 and TC
F reception is performed. When the high-speed signal is received, the sending of the synchronization signal is stopped in S69, the image signal is received in S70, and the image signal is received until the end of the image signal is detected in S71.

When the reception of the image signal is completed, the synchronization signal is received in S72, the transmission of the synchronization signal is started in S73, and the SOP is received until the EOP signal is received in S74.
At 73, the sync signal continues to be sent.

When the EOP signal is received, the MCF signal is transmitted in S75, the timer Tb is set for 3 seconds in S76, and the synchronizing signal is continuously transmitted to the MCF signal in S77.

Next, in S78, S79 and S80,
When the EOP signal and the DCN signal are received while monitoring the progress of Tb, and when the EOP signal is received, the step S75 is performed again.
When the subsequent operation is performed and the DCN signal is received, S
At 81, the transmission of the synchronization signal is stopped, and at S82, the line is released and the reception operation ends.

In the operation of the receiving side in the above-described first embodiment, the receiving side sends out the synchronizing signal even when the TCF signal which is a high speed signal is received from the transmitting side. As an example, as shown in FIG. 10, after receiving the DCS signal, the sending of the synchronization signal is once stopped and the reception of the high speed signal is concentrated.

After that, when the TCF signal is received, the sending of the synchronizing signal is started again, and after sending the synchronizing signal for 1 second, the MC
Sends the F signal.

As a result, it is not necessary to perform full-duplex communication at the time of receiving a high-speed signal, the data processing of the modem becomes simpler, and the cost of the modem itself can be reduced.

In order to realize this, as shown in FIG.
It is necessary to partially change the operation on the receiving side in FIG. 7 as shown in FIGS.

Here, the difference from FIG. 7 is that S60 is followed by S
The synchronization signal is transmitted in steps S102 and S103, and the DC signal is transmitted in steps S101 and S104 in steps S59 and S67.
The operation of stopping the transmission of the synchronization signal when S is received is added. Since the other points are the same as those in the first embodiment, the same reference numerals are given and the description thereof will be omitted.

[0078]

According to the inventions of claims 1 and 4, between the DIS-CFR and the EOP-in the facsimile communication procedure.
Between DCN, between NSS-TSI, by connecting with the synchronization signal between TSI-DCS, rather than the synchronization signal called a preamble from finished receiving a procedure signal of being sent per second, even after the procedure signaling procedure Signal and procedure with signal
By sending out the synchronization signal without making the signal silent ,
It is not necessary to send the synchronization signal for 1 second again to send the next procedure signal, which has the effect of shortening the time required for the procedure signal.

According to the second and fifth aspects of the invention, DIS, CFR, MCF, EO in the facsimile communication procedure are used.
At the time of sending P, EOM, and MPS, if there is no response from the other party and it is necessary to resend the same signal again after 3 seconds, the sync signal is temporarily stopped for resending,
If it is retransmitted, it takes communication time for the synchronization signal. Therefore, there is no signal between the procedure signals until the appropriate response is returned even after the above signals are sent.
By continuing to send the synchronization signal without doing so, there is an effect that the communication time can be shortened even when an error occurs.

[0080]

[0081]

According to the invention described in claims 3 and 6, after the start of the communication by the low speed signal, except when the low speed procedure signal such as DIS, CFR, MCF is transmitted and the high speed signal such as the TCF or the image signal is received. , No signal between procedural signals
By not sending the sync signal, the full-duplex communication is not performed when the high-speed signal is received, so that the communication time is about one second longer than that of the full-duplex communication during the TCF reception. However, the modem can be easily designed and the cost of the modem can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a communication procedure according to the first embodiment of this invention.

FIG. 3 is an explanatory diagram showing a communication procedure when a reception error occurs in the first embodiment.

FIG. 4 is a flowchart showing a transmitting side of the first embodiment.

FIG. 5 is a flowchart showing the transmitting side of the first embodiment.

FIG. 6 is a flowchart showing a receiving side of the first embodiment.

FIG. 7 is a flowchart showing the receiving side of the first embodiment.

FIG. 8 is a flowchart showing a receiving side of the first embodiment.

FIG. 9 is an explanatory diagram showing a conventional communication procedure.

FIG. 10 is an explanatory diagram showing a communication procedure of the second embodiment of the present invention.

FIG. 11 is a flowchart showing the receiving side of the second embodiment.

FIG. 12 is a flowchart showing a receiving side of the second embodiment.

[Explanation of symbols]

2-1 ... CPU, 2-2 ... ROM, 2-3 ... RAM, 2-4 ... non-volatile RAM, 2-5 ... Operation part, 2-6 ... Display, 2-7 ... Image processing unit, 2-8 ... reading unit, 2-9 ... Recording section, 2-10 ... Drive unit, 2-11 ... communication section, 2-12 ... NCU section, 2-13 ... LINE, 2-14 ... Sensor section.

─────────────────────────────────────────────────── ─── Continuation of front page (72) Shigeki Ohno 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Kazutaka Matsueda 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. Incorporated (72) Inventor Fumiyuki Takiguchi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Toru Maeda 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hidetaka Shimizu 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Sadasuke Kurabayashi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Motoaki Yoshino 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Kazuto Yanagisawa 3-30-2 Shimomaruko, Ota-ku, Tokyo In emissions Co., Ltd. (72) inventor Naoji Hayakawa Ota-ku, Tokyo Shimomaruko 3-chome No. 30 No. 2 Canon within Co., Ltd. (58) investigated the field (Int.Cl. ^7, DB name) H04N 1/32 - 1 / 34 H04L 5/14

Claims (6)

(57) [Claims] [1 claim: a full duplex communication is possible modem, facsimile communication method using a protocol signal generation means including synchronization signal generation means, the transmission and reception of the protocol signal by a full duplex communication, and more to the procedure signal generating means No communication between generated procedural signals
A facsimile communication method characterized in that a synchronizing signal is transmitted without using a signal. [2 claim] and full duplex communication is possible modem, facsimile communication method using a protocol signal generation means including synchronization signal generation means, the transmission and reception of the protocol signal by a full duplex communication, and more to the procedure signal generating means If it is possible to resend the same signal again after sending the generated procedure signal, the procedure signal and the procedure signal
A facsimile communication method characterized in that a synchronizing signal is sent out without making a signal between and . 3. A modem capable of full-duplex communication, a procedure signal generating means including a synchronizing signal generating means, and a receiving means for receiving a high speed signal for transmitting image information at a speed different from that of the procedure signal. In the facsimile communication method using and, the procedure signal is transmitted and received by full-duplex communication, and after the procedure signal is started to be transmitted , there is no communication between the procedure signal except when the procedure signal is transmitted and the high-speed signal is being received. A facsimile communication method characterized in that a synchronizing signal is transmitted without converting it into a signal. 4. A full-duplex communication modem and a procedure signal generation means including a synchronization signal generation means are provided , and transmission / reception of the procedure signal is performed by full-duplex communication, and the procedure signal generation means is connected to the procedure signal. Without making signalless between procedure signal
A facsimile apparatus , wherein a synchronizing signal is transmitted from the synchronizing signal generating means. 5. A full-duplex communication capable modem and a procedure signal generation means including a synchronization signal generation means are provided , and transmission / reception of the procedure signal is performed by full-duplex communication . If there is a possibility that the same signal will be retransmitted after sending, there is no communication between the procedure signals.
A facsimile machine characterized in that the synchronizing signal is transmitted from the synchronizing signal generating means after the above-mentioned procedure signal , instead of the signal.
Re device . 6. A modem capable of full-duplex communication, a procedure signal generating means including a synchronizing signal generating means, and a receiving means for receiving a high speed signal for transmitting image information at a speed different from that of the procedure signal. And the procedure signal is transmitted / received by full-duplex communication, and the synchronization signal generating means is a procedure signal and a procedure signal except when the procedure signal is transmitted after the procedure signal is transmitted and when the high-speed signal is being received. When
A facsimile machine, which sends a synchronization signal without making a signal between the two .